Today we are going to talk about a fundamental topic in biology and of great importance in various fields such as nutrition and health. It is about the oligosaccharides, essential molecules that are part of our daily lives without us even noticing. These molecules are composed of between 2 and 10 monosaccharide residues, linked by glycosidic bonds. Oligosaccharides can be present in a variety of nutrient-rich foods such as tomatoes, milk, onions, barley, rye and garlic, among others.
In this article, we will explore in detail the properties, functions and relevance of oligosaccharides, as well as their impact on health and various diseases.
Key features
Oligosaccharides play a crucial role in various industries, including food and agriculture. In the food field, they are recognized for their function as prebiotics, substances that are not digestible by the human digestive system, but that stimulate the growth of beneficial bacteria in the intestine, such as bifidobacteria and LactobacillusThis prebiotic action contributes to the promotion of a healthy intestinal microbiota, essential for several aspects of health, such as digestion and immune response.
In addition, oligosaccharides can be obtained from natural sources or through the hydrolysis of polysaccharides. Regarding their types, some common oligosaccharides among plants are glucose, galactose and sucrose, the latter being one of the most abundant in nature. Likewise, these molecules can also be bound to proteins, forming the so-called glycoproteins, important for biological processes such as cell recognition and the formation of the extracellular matrix.
Regarding their chemical structure, oligosaccharides are formed by monosaccharides that can be ketoses o aldoses, variations of simple carbohydrates that contain hydroxyl groups (alcohols). The cyclic structures of these monosaccharides can take on forms pyranose (as in glucose) or furanose (as in fructose). It should be noted that most oligosaccharides have a configuration D, although some may have non-digestible configurations by human enzymes, but can be processed by bacterial enzymes present in the colon.
Composition and functions of oligosaccharides
Oligosaccharides are composed of between 3 and 10 monosaccharide residues, although there are exceptions such as inulin, which can have more than 10 residues. The best known disaccharides, such as saccharose and lactose, are primary sources of energy in the human diet.
Apart from their energetic functions, non-digestible oligosaccharides, such as prebiotics, offer a number of health benefits:
- They improve the growth of beneficial intestinal bacteria, which contributes to a healthier gut.
- They lower cholesterol, benefiting cardiovascular health.
- Control diabetes, promoting blood glucose balance by promoting adequate intestinal flora.
- Reduce the risk of infections by strengthening the immune response.
In addition to these properties, oligosaccharides are used in the food industry as Artificial sweeteners, being a healthier option for many people. They also have applications in the control of osteoporosis, as they help improve the absorption of essential minerals such as calcium and magnesium.
Types of oligosaccharides
Oligosaccharides can be classified into two broad categories: Spaces y rare. Disaccharides such as saccharose and lactose are examples of common oligosaccharides. Lactose, for example, is composed of one glucose molecule and one galactose molecule, while sucrose is made up of glucose and fructose. Lactose is particularly prominent in milk, but many people are intolerant to this disaccharide due to a lack of the enzyme lactase in the body.
Rare oligosaccharides include those with more than 3 monosaccharide residues and found in plants. These include: fructooligosaccharides (FOS), Galactooligosaccharides (GOS) and xylooligosaccharides (XOS)These types of oligosaccharides are especially valued for their prebiotic capacity and their role in maintaining intestinal health and reducing the risk of chronic diseases.
Applications in colon cancer
Colon cancer is a disease whose risk factors are closely related to lifestyle, in particular to a diet high in meat and alcohol. Instead, a diet rich in fiber and milk can significantly reduce the risk of developing this disease. Oligosaccharides, as prebiotics, play an essential role in improving intestinal function, contributing to the prevention of diseases such as colon cancer.
Several animal studies have shown that the consumption of prebiotics significantly reduces the proliferation of cancer cells in the colon, in addition to improving the function of the intestinal barrier, reducing the absorption of toxic and carcinogenic substances.
Research in this field is ongoing, but current results suggest that oligosaccharides could be a valuable tool for the prevention of colon cancer and other diseases related to digestive system dysfunction.
With all the information available, it is clear that oligosaccharides play a key role in improving gut health, disease prevention and overall well-being thanks to their multiple functions.